D defs.my
Entry 1 sense Webster, 1913

Sulphion

· Sul·phi·on · IPA
01 n. A hypothetical radical, SO4, regarded as forming the acid or negative constituent of sulphuric acid and the sulphates in electrolytic decom…
  1. 1.
    A hypothetical radical, SO4, regarded as forming the acid or negative constituent of sulphuric acid and the sulphates in electrolytic decomposition; -- so called in accordance with the binary theory of salts.(Chem.)